battery

These two days i'm searching on lithium polymer batteries and found that the min weight for the 36V batteries is 5Kg .And for 36V&20Ah the weight is 6kg.. And i also found that the chargers are not sold with them. And we have to buy thw chargers which are too costly.

links:http://www.powerstream.com/LLL-polymer.htm
http://www.eigbattery.com
and other minor sources.


P.S I think the power rating of our bot is too high. I think we should re check these calculations again.